Arachnids Flashcards
(15 cards)
Otobius spp
Spinose ear tick (soft tick)
- livestock, humans, dogs
- adults are not on the animal and do not feed
- larvae and nymphs taxied long distances
Argas spp.
Fowl tick (soft tick)
- domestic and wild fowl
- flattened leathery, textured body, lateral line or crease
- engorge rapidly to take advantage of available host
- survive arid conditions
- frequent feedings leads to opportunities to transmit pathogens
- infestations on skin, but most of the time hide away from hosts
Sarcoptes Scabiei
Sarcoptic mange mite, itch mite , scabies mite (burrowing mite)
- all domestic animals and humans (does not switch between host species)
- round, legs short, suckers on long unsegmented stalks
- ELNA life cycle
- skin infestation leading to erythema, scale and crust formation
- tx using MCLs
Sarcoptes scabiei - DOG
- begins on hairless areas of the body, lateral elbow and pinna of ear are common starting places
- lesions of follicular papules, areas of erythema, crusts of dried serum and blood and pruritus
- treatment of pets cure the humans they infest
- test by doing a skin scraping
Sarcoptes scabiei - SWINE
main modes of transmission
- carrier sows to piglets during suckling
- during service between infested boards to gilts
pathogenesis
- pigs scratch continuously and lose condition
- first lesions are wheals, general erythema around eyes, snout, external ears, fronts of hock
- progress to scabs
- skin becomes wrinkled, covered with crusty lesions, thickened
- lesions progress to hyperkeratosis
- diagnose by mites in ear wax
- tx sow before farrowing
Sarcoptes scabiei - CATTLE
- infestation on neck and base of tail
- potentially most severe cattle mange
- mild infection- scaly skin
- severe infection - thickened skin
- downgrading of hides, drop in meat and milk production
- diagnose by skin scraping
- tx with eprinomectin for lactating dairy cattle
- REPORT TO AUTHORITIES
Notoedres cati
Noteodric cat mite (burrowing mite)
- closely resembles sarcoptes, but smaller
- located on HEAD
- diagnose with skin scrape
Knemidocoptes spp.
SCALY LEG MITE, SCALY FACE MITE (burrowing mite)
- chickens and turkeys, cage birds
- adult mites are spherical
- spend entire life cycle on the host
- infect under scales of leg, comb, wattles and neck
- inflammation and keratinization of skin of legs and or face
- lameness, malformation of feet
Chorioptes Bovis
cattle, small ruminants, equids (non burrowing mite)
- rounded mouthparts and sucker shape at end of stalks
- feed on skin surface and epithelial debris
- infestation of tailed, udder and legs (lesions localized)
- pathogenic in late winter damaging the hides
Psoroptes ovis
(non burrowing mite)
SHEEP SCAB MITE
- oval with pinter mouthparts for piercing and chewing **
- causes scab mange
- distribution of infestation on skin depends on season:
- reservoir sites during non-winter months
- rapid spread in winter
pathogenesis
- zone f inflammation with erous exudate
- dry crust covered center develops with moist borders
- mite activity leads to intense itching, restless rubbing, scratching, ragged wool
REPORT TO STATE AUTHORITES
Otodectes cynotis
non-burrowing mite
EAR MITE of dogs, cats, ferrets, foxes, rabbits and humans
- long legs extend beyond body margin, suckers differ across gender, copious dark cerumen
- in cats: dry waxy parchment like material in ears with large numbers of mites
Cheyletiella yasguir
non-burrowing mite
WALKING DANDRUFF of dogs and humans
- Waist, walking dandruff and palpal claws
- infestation of fur and hair
- results in dandruff
- diagnose with adhesive tape or scotch tape swab
Demodex canis
hair follicle mites
DEMODECTIC MANGE MITE, FOLLICLE MITE of dogs
- cigars with legs
- live entire life cycles in hair follicles and sebaceous glands
- transmission from bitch to newborns
- localized infestation associated with alopecia: do not treat
- generalized infestation characterized by 5 more more areas of localized disease or entiree body region, hair sparse and skin coarse and dry, develops to “red mange”: requires treatment
- diagnose with skin scraping but mites are normal inhabitants, so presence does not indicate disease
Dermanyssus spp
blood sucking mite
RED CHICKEN MITE, ROOST MITE OF BIRDS of domestic and wild fowl
- engorged females appear gray to red in color
- needle like mouthparts
- NIGHT MITES during the night they appear anywhere on the skin, but during the day they hide in cracks
- pathogenesis: change of behavior due to itching, weight loss, reduced egg yield, transmit disease
LIFE CYCLE:
- survive off the host for months
- able to complete their life cycle in less than 7 days
- lay eggs OFF THE HOST
Ornithonyssus spp
blood sucking mites
NORTHERN FOWL MITE (O. sylvarum) TROPICAL FOWL MITE (O.bursa) of chickens, birds and humans
- most common poultry mite
- engorged females most often seen (grey to red color) with long mouthparts
- life on host day and night
LIFE CYCLE:
- survive off the host for only a short period (10 days)
- able to complete life cycle in less than 7 days
- lay eggs ON THE HOST
